<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>websocket</title>
</head>
<body>
    <script>
        // let socket = new WebSocket("ws://localhost:8888");
        let socket = new WebSocket("ws://localhost:9999");
        //当连接建立成功之后执行此回调函数
        socket.onopen = function() {
            console.log('客户端连接成功')
            socket.send('hello')
        }
        //当客户端收到服务器的消息之后执行此回调函数
        socket.onmessage = function(event){
            console.log(event.data)
        }
    </script>
</body>
</html>